<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style type="text/css">
        /* 重置带有默认样式的元素 */
        body,
        div,
        img {
            margin: 0;
            padding: 0
        }

        html,
        body {
            height: 100%;
            background: black;
        }

        #outer,
        img {
            border-radius: 3px;
            font-size: 0;
        }

        /* 外层盒子设置 */
        #outer {
            border-radius: 7px;
            width: 208px;
            margin: 10px auto;
            padding: 8px 8px 10px 10px;
            background: white;
            overflow: hidden;
            zoom: 1;
        }

        /* 图片样式 */
        #outer img {
            float: left;
            margin: 2px 2px 0 0;
        }

        #outer img.clear {
            clear: both;
        }
    </style>

    <script type="text/javascript">
        window.onload = function () {
            var oSmalImg = document.getElementById("outer").getElementsByTagName("img");
            /* 鼠标滑动事件 */

            for (var i = 1; i < oSmalImg.length; i++) {
                oSmalImg[i].index = i;
                oSmalImg[i].onmouseover = function () {
                    oSmalImg[0].src = "./image/big_" + this.index + ".jpg";
                };
            }
        };
    </script>
</head>

<body>
    <div id="outer">
        <div id="big">
            <img src="./image/big_1.jpg" alt="">
        </div>
        <img src="./image/small_1.jpg" alt="">
        <img src="./image/small_2.jpg" alt="">
        <img src="./image/small_3.jpg" alt="">
        <img class="clear" src="./image/small_4.jpg" alt="">
        <img src="./image/small_5.jpg" alt="">
        <img src="./image/small_6.jpg" alt="">
        <img src="./image/small_7.jpg" alt="">
        <img src="./image/small_8.jpg" alt="">
        <img src="./image/small_9.jpg" alt="">
        <img src="./image/small_10.jpg" alt="">
        <img src="./image/small_11.jpg" alt="">
    </div>
</body>

</html>